Alarm-lock



(ModL) I. N. BUCK;

ALARM LOCK.

Patentd May 16, 1882.

N PETERS, mmum n m. Waxhington. o c.

will be specified in the claims hereunto anringing apparatus.

,NITED STATES PATENT OFFICE.

ISAAC N. BUCK, OF ELGIN, ILLINOIS.

ALARM-LOCK.

SPECIFICATION forming part of Letters Patent No. 257,845, dated May 16, 1882.

Application filed January 27. 1852. (Model.)

cation, taken in connection with the drawings furnished and forming a part of the same, is a clear, true, and complete description of my said improvement.

The object of my invention is to provide for the sounding of an alarm upon the unauthorized withdrawal of a lock or latch bolt,whetlier the latter be actuated by a key or a knob, and to also provide for conveniently placing the alarm mechanism in or out of gear, as occasion may require.

After fully describing a lock embodying my invention and certain variations in the construction thereof the features deemed novel nex ed. 1

Referring to the drawings, Figure l is aside view of alock embodying my invention,-one of the sides of the lock-case being removed. Figs. 2 to 5, inclusive, areviews ot' modifications of the alarm-setting devices.

The lock-case has a face-plate, A, rim ]5 and side plates, 0, one of which is removable.

The alarm embraces the clock-work a, the bell b, and escapement-lever c, and these are substantially as heretofore in automatic bell- Theescapement-lever c has secured to it a vertically-extending arm, 11, which, when free to do so, permits the escapement-lever to rapidly vibrate, and, through the striker 6, attached thereto, to make rapid strokes upon the bell. The arm dis controlled by a sliding block,f, having a stud, g, which is in engagement with said arm so long as the sliding block f occupies its normal position; but when said block is moved rearward the stud y is removed from contact with said arm. The sliding blockfis also swiveled upon the screw j", which occupies the slot f in said block, and alight spring, f bears upward against the rear end of said block, thus causing its front end to be normally depressed. The longitudinal movements of the sliding block are caused by the movement of the latchbolt I), which is thrown forward, as usual, by

a spring, h, and retracted by a knob-spindle and hub, substantially as heretofore; or said latch-bolt may be retracted by means of a key, as is common to night-latches. The forward movement of the block f is due to the contact with the rear end thereof of the arm a of the bolt, and the rearward movement of said block is due to the contact with the front end thereof of the vertical shoulder k onsaid bolt near its head. This rearward movement of the block, incident to the retraction of the bolt, is followed by the sounding of the alarm; and therefore, to provide for the ordinary use of the look without said alarm I combine with the sliding block a setting-cam, t, beneath and upon which the front end of said block rests. The axis of the setting-cam, as shown in Fig. 1, extends through the side of the lock-case, and is diametrically slotted for the reception of a key like a screw-driver, so that said cam may be partially rotated, and thereby elevate the trout end of said block or permit it to fall, as may be required. i

As thus far described, it will be readily understood that when the cam is so turned as to elevate the front end of the sliding block f, thus rendering said block longitudinally movable, the bolt D cannot be retracted for opening a door or drawer to which the lock is attached without causing the alarm to sound, and that when the cam is turned downward so as to permit the front end of said block to fall, as indicated in dotted lines in Fig. 1, so that said block cannot be moved longitudinally, and therefore no alarm will be sounded. In some cases this brief alarm will not be deemed sufficient, and I therefore provide for a more extended alarm, which will continue as long as the clock-work can be operated by its spring. For obtaining this greater alarm, as illustrated in Figs. 4 and 5, I provide the under side of the sliding block with a shoulder, m, which, by engaging with one edge of the cam, as seen in Fig. 4, maintains the block in its rearward position, when once placed therein, until the cam is so turned as to release it. In order that the alarm may be either short, as first described, or a full alarm, the cam has one rounded edge, as at n, Fig. 5, so that when so rotated as to place said rounded edge in the plane of the shoulder at the latter can ride freely over said edge and resume its forward position precisely as when arranged as in Fig. 1.

' of the requisite keys.

As shown in Fig. 1, the alarm setting, as well as the winding of the clock-work spring, is effected through apertures in the side plate of the lock-case, thus necessitating that the door or drawer on which the lock is mounted be correspondingly bored to admit of the use This extra cutting of the door or drawer may be wholly obviated if desired. The spring-arbor 0 may be readily provided with a gear engaging with a pinion on an arbor extending to and into a recess in the face-plate A, and be readily accessible to a key or be provided with a thumb-piece for winding; but this may be indefinitely varied without in any manner affecting my invention.

The cam 1, instead of being mounted upon an axis which stands atright angles to the sliding block, may as well have its axisparallel with said block, and be located in a lug projecting inward from the face-plate, as illustrated in Figs. 2 and 3, so that the outer end of said axis will project to the outer surface of the face-plate and be accessible therefrom for setting. If the setting-cam be accessible from the face-plate, however, only the brief alarm can be sounded if the setting device be arranged as described, because in closing the door, after setting the alarm, the bolt would of necessity be forced inwardly, which would so set the alarm as to cause it to run down. In order, however, that the full alarm may be available with aface-plate adjustment, the sliding block should obviously be placed directly under the control of the knob-spindle, so that the boltitself may be moved inwardly in closing the door without sounding the alarm, and, also, so that when the knob is turned for retracting the bolt the alarm will be sounded.

Although I have shown the sliding block combined with the latch-bolt as a preferred arrangement, I do not limit myself thereto, ex-

the lock-case, and is slotted, so as to be rotated by a plate-key similar to a screw-driver; but it is immaterial, so far as relates to my invention, how said bolt is actuated.

Having thus described in yinven tion, I claim as new and desire to secure by Letters Patent- 1. The combination, substantially as hereinbefore described, of a bolt, a clock-work alarm, and a sliding block for controlling said alarm and adjustable with relation to the bolt and its actuating devices, whereby, when said bolt is retracted, the alarm will or will not be sounded, according to whether the block be movable or stationary as a result of the special adjustment of said block.

2. The combination,substantially as herein-v bet'ore described, of a knob-latch bolt, a clockwork alarm, and a sliding block for controlling said alarm and adjustable with relation to the bolt, whereby, when the knob is rotated, the alarm will or will not be sounded, according to whether the block be movable or stationary as a result of the special adjustment of said block.

3. The combination of the bolt, the alarm, and the sliding block with the setting-cam, which prevents said block from sliding or perniits it to slide, and is accessible from the exterior of the lock-case, substantially as described.

ISAAG N. BUCK. Witnesses:

A. H. BARRY, R. D. HOLLENBEAK. 

